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pounds emissions 1 dramatic reduction
The Highwa roadwav nl which 3 1 million miles in roads The Interstate Svstem accounts li
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1993 Percent Change access control Air Quality Amtrak Annual Vehicle-Miles Automobiles axle loads billion bridges cars Central Intelligence Agency cents per gallon cents per VMT compared to 1970 congestion Constant 1970 cents Current cents cylinder Avg days in exceedence decreased Fact Book Federal Highway Administration FHWA PL Freeways Functional System functionally obsolete Gasohol Gasoline Tax Rate Gross Domestic Product Highway Account Highway Expenditures Highway Fuel Highway Receipts Highway Statistics Highway Trust Fund International Road Federation licensed drivers medium and heavy Miles per Gallon Minor Collector Motor Fuel Motor-fuel tax National Highway System Nationwide Personal Transportation NHS Mileage Nonattainment Ozone Pavement Condition percent compared percent in 1973 percent increase percent of total Personal Transportation Survey principal arterial proposed NHS railroad crossings roads and streets Source South Dakota street mileage structurally deficient total highway Total NHS total road total travel travel VMT Trends urban travel vehicle-miles of travel